Launch file syntax doubt

Course Support TF ROS 101
1

Hi,
What do “cat” and “-d” mean in the following code?

tf_doubt_1
tf_doubt_1.png2525×668 92.7 KB

2

cat

Is a UNIX shell command to print the contents of a file. For example:

cat test.txt

This will print the contents of the test.txt file.

As for the

-d

Is a command for rviz that indicates RVIZ to load from a certain previously saved .rviz file. This allows it to open with laser elements, camera or certain tfs selected. Is the default way of laoding rviz with a file.